Yes, you can.
I believe that there is one HUGE agency in LA that does most if not all of the pornstars.
I always forget the name of it though.
My plan would be to say that you want the filming for a private video that you are going to show to studios/producers to see if it could be picked up - a kind of pilot, if you like. The thing is, some girls would not want to do private videos so you have to use this line. Most though, do not care about whether private or not, as long as you are paying.
Look here for English example:
http://www.be-seen-here.co.uk, there are quite a few models willing to do hardcore b/g (boy and girl). Some only with boyfriend only, but others don't care. The quality is not great, but there are a few good ones.
For instance, look at this slut here:
http://www.be-seen-here.co.uk/elizabeth2.htm
Or even this slut:
http://www.be-seen-here.co.uk/amberrox.htm
This second girl has been seen doing a DP with Lexington Steel as "Allura Bond". There are no rates listed for her, but they seem to approximate around £75-100.
OK lets add up the cost:
£200 for 2 hours work (preparation and fucking of girl)
£300 for use of cameraman, cameraman house and cameraman equipement (I have been offered a quote approximately this)
£100 for 2 PCR DNA HIV tests (good for 15 days after exposure) for him and her.
So for £600 or about 900 Euros, you get to fuck a girl's pussy, asshole, mouth, french kiss her, lick her butthole, go down on her, multiple position, and if you pick the right girl then she will love this (I truly believe this of some pornstars, they don't get paid much anyway, so some of them do it also because they enjoy it), AND you get to keep a memento of the occasion.
Not bad eh for 900 Euros tops?? For what it is, I think it is pretty good value compared to bang per buck (excuse the pun) with usual Walletjes, FKK, Prive or Escort.